1123143121 has 2 divisors, whose sum is σ = 1123143122. Its totient is φ = 1123143120.

The previous prime is 1123143089. The next prime is 1123143137. The reversal of 1123143121 is 1213413211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 989417025 + 133726096 = 31455^2 + 11564^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123143121 - 2⁵ = 1123143089 is a prime.

It is a super-2 number, since 2×1123143121² = 2522900940499241282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1123143821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561571560 + 561571561.

It is an arithmetic number, because the mean of its divisors is an integer number (561571561).

Almost surely, 2^1123143121 is an apocalyptic number.

It is an amenable number.

1123143121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123143121 is an equidigital number, since it uses as much as digits as its factorization.

1123143121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 19.

The square root of 1123143121 is about 33513.3275130954. The cubic root of 1123143121 is about 1039.4693795267.

Adding to 1123143121 its reverse (1213413211), we get a palindrome (2336556332).

The spelling of 1123143121 in words is "one billion, one hundred twenty-three million, one hundred forty-three thousand, one hundred twenty-one".